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Revision 071108
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Example 5 – Basic understanding of Overlapping VLANs
Receiving
Port #
Tagged VID
in packet
Destination
Address
Transmitting
Port #s
Notes
TX1 Untagged MAC on port TX2,
VID=4
TX2 Unicast Traffic
TX1 Untagged MAC on port TX3 TX2 Floods VLAN 4
TX1 VID 4 MAC on port TX2,
VID=4
TX2 Strips VID off packet
TX1 VID 4 Unknown MAC TX2 Strips VID off packet & Floods VLAN 4
TX2 Untagged MAC on port TX1,
VID=2
TX1 Unicast Traffic
TX2 Untagged MAC on port TX5,
VID=2
TX5 Unicast Traffic
TX2 VID 2 or 3 MAC on port TX5,
VID=2 and 3
TX5 Strips VID off packet (or floods if MAC
is unknown for VID)
TX2 Untagged Unknown MAC TX1, TX3-TX8 Floods VLAN 2
TX3 Untagged MAC on port TX1,
VID=3
TX2, TX4-TX8 Floods VLAN 3
TX3 Untagged MAC on port TX2,
VID=3
TX2 Unicast Traffic
TX3 Untagged MAC on port TX5,
VID=3
TX5 Unicast Traffic
TX3 VID 2 or 3 MAC on port TX2,
VID=2 and 3
TX2 Strips VID off packet (or floods if MAC
is unknown for VID)